Air charging and priming device for suction-pumps.



J. ASTRUM.

AIR OHAMING AND mmm@ DEVICE nm fmffmw PUMPS.

wwwa;

J'. ASTRUM.

AIR 11H/mm1@ Mm 'Ummm '15mm-z vom sUUTmN PUMPS.

J. ASTROM.

.AIR GHARGING AND PRIMING DEVICE POR SUG'IION PULJTS.

APPLICATION FILED MA. 17, 1913. 1,074,098. Pa-2.6m@ ffm-m., safe,

JOI-IN ASTROM, OF FORT WAYNE, INDIANA.

AIR CHARGING AND PRIMING DEVICE FOR SUCTION-PUMPS.

Specification of Letters Patent.

Patented Sept. 30, 1913.

Application mea March 17, 191e. serial No. 754,679.

To all whomz't may concern:

Beit known that .I, JOHN AsTnoM, of Fort Wayne,.Indiana, have invented an Air Charging and. Priming Device for Suction-l Pumps, ot which the `:following is a specification.

This invention relates to suction pumps and the object which I have in View is to provide means for remedying the Adefects of a common pump used in connection with a pneumatic storage system.

Vhen a suction-pump is used in connection with a system in which a compressedair receiver is used for the storage, and more particularly when` the jpump discharges into said receiver, the air is gradually absorbed by the passing Water because of the well known fact that a larger amount of'air is soluble in Water under compression than under atmospheric pressure. This absorbed air must be replaced in the intake, yand it is customary under such circumstances to provide a valve through which air can be admitted into the suction-compartment of the pump, which then is required to discharge this air with the water pumped into thereceiver. The free air thus admitted expands of course to a volume correspnding to the suction-pressure or vacuum in the pump, and with high suction-lifts therefore only a small part ot the pumps displacement of Vfree air can be admitted without preventing the pump for drawing water. As soon as sufficient air is admitted to4 prevent the pump from drawing water, the air-pocket lformed between the valves becomes big enoughto prevent the pump from compressing the entering air sufficiently to discharge it against the Water-pressure in the receiver. The pump accordingly becomes unprimed, as it will not again pick up water after the air-valve is shut. The adjustment ot airadmission is delicate and the described method is invariably a `failure with small pumps and high suction-lifts. that is said above applies equally to any force-pump provided with an air-chamber, as practically all force-pumps are; the air in the air-chamber is gradually absorbed by the water pumped through, which is incompletcly saturatedw'ith air at the higher pressure. Unless the air -is'renewed from time to time the air-chamber ultimately becomes filled with water. It will be seen that the airchamber is actually a small receiver mounted directly on the-pump.

The object of my invention is to provide a simple device for air-charging which allows the pump to draw and charge part of its displacement of free air independently of height of suction-lift and water-pressure in the receiver, and it will also not imprime the pump, but instead can be used for repriming the pump should it for any reason lave become air-bound or unprimcd.

The nature of my invention and in what manner it may be performed is best described by reference to the accompanying drawings, wherein,

Figure l shows in more or less diagrammatic longitudinal section and part elevation a water-pumping s vstcm according` to my invention; Figs. 2 and 3 illustrate alternative arrangements thereof; Figs. et, 5 and G show different positions ot the chargingand-priming device, namely the charging, priming and shut positions respectively; Figs. 7 and 8 show, partly in elevation and partly inv section, alternative forms of the charging-and-priming device which will eifect the same result; and Fig. 9 shows in longitudinal section the form which the invention will assume as in the case o'l a direct action force-pump.

The reference letters refer cach to the same part in each figure oi the drawings.

In Fig. 1 of the drawing there is illustrated a pump A, a receiver B, a discharge-pipe C connecting the pump with the receiver and discharging into the latter, and a suction-pipe Dhaving on its end a foot-valve (Z, said suction-pipe discharginginto the suction-chamber a of the pump. The footvalvc fl acts as a check-valve to hold the pressure during the air-charging and priming operations.

At E is the service-pipe which leads to the water-distribution system. The receiver is partially filled with water, the upper part thereof forming an air-compression chamber b.

The pump A comprises the suctionchamber a', the pump-chamber a2, and the discharge-chamber as, separated from each other by pump-valves a, ai of any preferred `style and pattern opening upward. The

pump-plunger n," reciprocatcs through a stuffing box a? so as to alternately increase and diminish the water-volunm in the chamber o2 and thereby alternately draw water from the suction-chamber u to the pumpchamber a2 through the valve of. `andldiC a valve in said pipe, and means for admitting air thro1 gh said valve.

2. The combination with a pump, and a receiver connected with the discharge-side thereof, of a pipe leading from the discharge-side to the suction-side of the pump, a valve in said pipe, means for admitting air through said valve, and means for independently shutting ofi' the air while permitting the water to How through said Valve into the suction-side of said pulnp.

3. The combination with aA pump, and a receiver connected with the discharge-side thereof, of a pipe leading from the discharge-side to the suctionside of the pump,

a valve in said pipe, and means for admit,

ting air into said pipe while the water is passing therethrough, whereby air is drawn into said pump along with the Water from the receiver.

Li. The combination with a pump, and a receiver connected with the discharge-side thereof, of a pipe leading from the discharge-side to the suction-side of the pump,

-a valve in said pipe,` means for-adn'iitting air into said pipe while the water is passuig therethrough whereby air is drawn into said pump along with the water from the receiver, and means for shutting off the air from said pipe while permitting the Water to flow through said pipe.

5. The combination with a pump, and a receiver connected with the dischargeside thereof, of a pipe leading from the discharge-side to the suction-side of the pump,

and a valve in said pipe, combined with a constricted nozzle for the water, and an airpassage l )ading to the outside of said noztle whereby air is inspirated into said pipe when water flows therethrough.

G. The combination with a. pump, and a receiver, connected with the discharge-side thereof, of a pipeleading from the dischargeside to the suction-side of the pump, a valve in said pipe, combined with a constricted nozzle for the water and an airpassage leading to the outside of said nozzle whelieby air inspirated into said pipe when water flows theretln'ough, and means for independently shutting ofil the air.

7. The combination with a pump, and a receiver connected with the discharge-side thereof, of a pipe leading from the discharge-side to the suction-side of the pump, u three-way cock in said pipe adapted to permitl water to pass from the receiver into the suction-side ofthe pump, said cock having a side-inlet for air, and a check-valve in said side-inlet.

8. The combination with a pump, and a lreceiver connected with the discharge-side thereof, of a pipe leading from the discharge-side to the suction-side of the pump, a three-Yay cock in said pipe, and a checkh valve adapted to admit air connected to the4 third way of said cock.'

9. The combinationwith a pump, and a receiver connected with the dischargeside thereof, of a pipe leading from the'discharge-side to the suction-side of the pump, and a three-way cock in said pipe, a checkvalve adapted to admit air connected to the third way of said cock, said three-way cock having a rotatable plug which is formed `with a quadrantal passage adapted to con-` neet any two adjacent ways of the cock and a constricted diametral passage extending from one end of said quadrantal passage to the opposite side of said plug.

In witness whereof I have hereunto set my hand in the presence of two witnesses. JOHN ASTROM.

lVitnesses:

ROSE G. Swn'rz, ARTHUR W.` PARRY. 

